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Asymmetry ratio as a parameter of Eu 3+ local environment in phosphors
- Source :
- Journal of Rare Earths. 36:474-481
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- Study of the local environment of certain ion is quite a complex problem. Due to the unique luminescent properties, Eu3+ ions can be used as a structural probe. In this paper, effect of doping concentration, excitation wavelength and excitation mechanism on asymmetry ratio was systematically studied using Y3Al5O12:Eu3+, YVO4:Eu3+ and Y2O3:Eu3+nanophosphors. The asymmetry ratio gives information about the local surrounding and environmental changes around the Eu3+ ions. Asymmetry ratios of YAG:Eu3+ and YVO4:Eu3+ nanopowders were calculated using standard technique and the obtained average values were found to be 0.75 and 8.2, respectively. However, it is found that standard method of asymmetry ratio calculation is suitable only for samples where all Eu3+ ions occupy one site. The “multisite model” of asymmetry ratio calculation was developed and used for Y2O3:Eu3+ nanocrystalline powders. Average value of asymmetry ratio for Eu3+ ions occupied “normal” sites is 6.0 and for Eu3+ ions occupied “defect” sites is 2.3.
- Subjects :
- Materials science
media_common.quotation_subject
Doping
Value (computer science)
Phosphor
02 engineering and technology
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Molecular physics
Asymmetry
Nanocrystalline material
0104 chemical sciences
Ion
Geochemistry and Petrology
0210 nano-technology
Luminescence
Excitation
media_common
Subjects
Details
- ISSN :
- 10020721
- Volume :
- 36
- Database :
- OpenAIRE
- Journal :
- Journal of Rare Earths
- Accession number :
- edsair.doi...........191312c844e66814f67d19c6024f0754